Well it is a possibility, but... I would expect at maximum them becoming spirits like Sauron, in fact harmless. There were these ideas about Elven spirits who refused to go to Mandos, so something like that. But nevertheless, they will no longer be in human bodies but only in the wraith-world, maybe from time to time scaring a woodcutter from Rhun during his night walk, but that's about all they could do.
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"Should the story say 'he ate bread,' the dramatic producer can only show 'a piece of bread' according to his taste or fancy, but the hearer of the story will think of bread in general and picture it in some form of his own." -On Fairy-Stories
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